Facebook app redirecting code help!?

I'm trying to find a line of code I can put in my site that generates something like "?412312" at the end of a link im posting on facebook. Basically something that makes it look like each click is unique so facebook doesn't mess with the domain (confirm like box). Much appreciated thanks!

Use this for comment box.

Hmmm, i always used

<?php $random_number1 = rand(1, 999999); ?> or
<?php $random_number = rand(1, 999999999999); ?>

Can that be used at the end of facebook apps?

example:

apps.facebook.com/blahblah/?23141